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Note D - Stock-based Compensation - Stock Option Activity (Details)
 3 Months Ended
Mar. 31, 2017
USD ($)
$ / shares
shares
Outstanding (in shares) | shares 56,131
Outstanding (in dollars per share) | $ / shares $ 10.85
Exercised (in shares) | shares (4,000)
Exercised (in dollars per share) | $ / shares $ 11.54
Outstanding (in shares) | shares 52,131
Outstanding (in dollars per share) | $ / shares $ 10.80
Outstanding (Year) 3 years 73 days
Outstanding | $ $ 286,116 [1]
Options exercisable (in shares) | shares 39,331
Options exercisable (in dollars per share) | $ / shares $ 10.77
Fully vested and exercisable (Year) 2 years 219 days
Fully vested and exercisable | $ $ 217,124 [1]
[1] The intrinsic value of a stock option is the amount by which the market value of the underlying stock exceeds the exercise price of the option. The per share market value of our common stock, as determined by the closing price on March 31, 2017, was $16.29.